Iron becomes passive by ..................... due to formation of .....................
- Adil. $HCl, Fe_2O_3$
- B$80\% \text{ conc. } HNO_3, Fe_3O_4$
- Cconc. $H_2SO_4, Fe_3O_4$
- Dconc. $HCl, Fe_3O_4$
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Similar Questions
In which of the following transition metal ions (aquated) is the colour not correctly matched?
Give examples and suggest reasons for the following features of the transition metal chemistry:
$(i)$ The lowest oxide of transition metal is basic,the highest is amphoteric/acidic.
$(ii)$ $A$ transition metal exhibits highest oxidation state in oxides and fluorides.
$(iii)$ The highest oxidation state is exhibited in oxoanions of a metal.
$(i)$ The lowest oxide of transition metal is basic,the highest is amphoteric/acidic.
$(ii)$ $A$ transition metal exhibits highest oxidation state in oxides and fluorides.
$(iii)$ The highest oxidation state is exhibited in oxoanions of a metal.
Difficult
View SolutionWhich of the following statements is not correct?
Difficult
View SolutionAssertion : $PbI_4, BiCl_5, FeI_3, CuI_2$ do not exist. Reason : Higher oxidation states of metal ions are strong oxidising agents which give redox reactions with the iodide ion.
Medium
View SolutionArrange the oxides $CrO$,$CrO_3$,and $Cr_2O_3$ in the decreasing order of acidic strength.
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